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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2025-03-24 14:56:06 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:33:37 +0200 |
| commit | b9249da6b0ed56269d4f21850df8e5b35dab50bd (patch) | |
| tree | 29764e0c6fd448c8861149b55bd3c628cbf20558 /drivers | |
| parent | 546685793f4cbd3ae66c552329878dc5e60e320a (diff) | |
| download | linux-b9249da6b0ed56269d4f21850df8e5b35dab50bd.tar.gz linux-b9249da6b0ed56269d4f21850df8e5b35dab50bd.tar.bz2 linux-b9249da6b0ed56269d4f21850df8e5b35dab50bd.zip | |
objtool, media: dib8000: Prevent divide-by-zero in dib8000_set_dds()
[ Upstream commit e63d465f59011dede0a0f1d21718b59a64c3ff5c ]
If dib8000_set_dds()'s call to dib8000_read32() returns zero, the result
is a divide-by-zero. Prevent that from happening.
Fixes the following warning with an UBSAN kernel:
drivers/media/dvb-frontends/dib8000.o: warning: objtool: dib8000_tune() falls through to next function dib8096p_cfg_DibRx()
Fixes: 173a64cb3fcf ("[media] dib8000: enhancement")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/bd1d504d930ae3f073b1e071bcf62cae7708773c.1742852847.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/r/202503210602.fvH5DO1i-lkp@intel.com/
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/dvb-frontends/dib8000.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/media/dvb-frontends/dib8000.c b/drivers/media/dvb-frontends/dib8000.c index 301d8eca7a6f..f2fae575e84c 100644 --- a/drivers/media/dvb-frontends/dib8000.c +++ b/drivers/media/dvb-frontends/dib8000.c @@ -2701,8 +2701,11 @@ static void dib8000_set_dds(struct dib8000_state *state, s32 offset_khz) u8 ratio; if (state->revision == 0x8090) { + u32 internal = dib8000_read32(state, 23) / 1000; + ratio = 4; - unit_khz_dds_val = (1<<26) / (dib8000_read32(state, 23) / 1000); + + unit_khz_dds_val = (1<<26) / (internal ?: 1); if (offset_khz < 0) dds = (1 << 26) - (abs_offset_khz * unit_khz_dds_val); else |